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The complete set of values of a so that ...

The complete set of values of a so that equation `sin^4 x+ a sin^2 x+ 4=0` has at least one real root is (A) `(- oo, -5]` (B) `(- oo , 4] uu [ 4, oo)` (C) `(-oo, -4]` (D) `[4, oo)`

A

`(oo, -5]`

B

`(-oo, 4] uu [4, oo)`

C

`(-oo. -4]`

D

`[4,oo)`

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VK JAISWAL-QUADRATIC EQUATIONS -EXERCISE (SUBJECTIVE TYPE PROBLEMS)
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